The Fifteenth reconstruction amendment (1869) was intended to protect freedmen against the injustices depicted in this cartoon.
In 1869, Congress passed a constitutional amendment guaranteeing black suffrage.
The Civil War Amendments, often known as the Reconstruction Amendments, are the Thirteenth, Fourteenth, and Fifteenth Amendments to the United States Constitution, which were ratified between 1865 and 1870.
The Thirteenth Amendment (1864) outlawed slavery and involuntary servitude.
The Fourteenth Amendment (1866) emphasizes citizenship rights and equal legal protection for all people.
The Fifteenth Amendment (1869) forbids discrimination in citizens' voting rights based on "race, color, or prior condition of servitude."
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GOLD IN THE SKY - By Alan E. Nourse
We can see in the story that the setting is in a cockpit, in a lab, simulating a landing to Mars because of this paragraph; "Greg twisted around in the cockpit that had been built just big enough to hold him, and shifted his long legs against the brace-webbing, trying to get them comfortable." We can see that Greg Hunter is nervous, "His heart hammered in his throat, and his eyes ached fiercely, but he paid no attention. His finger crept to the air-speed indicator, then to the cut-off switch." The time period we can state is around the 1950s. It implied the first trip to Mars, "He heard the count-down monitor clicking in his ears, and his hands clenched into fists. How far from Mars would he be 10 minutes from now?" In conclusion, the time is believed to be sometime in the 1950s, and the setting is in a lab where Gregory Hunter is going on a trip to mars when something wrong has happened.
It is false because I said so
The minimum number of photons of green light that can be detected by the human eye is 6.
Given that;
E = nhc/λ
E = energy of the photon = 
J
n = number of photons = ?
h = Planks constant = 
Js
c = speed of light = 
m/s
λ = 
m
Making number of photons the subject of the formula;
n =
n = 6 photons
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